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thermo-diffusion
thermo-diffusion n.
Brit. 
/ˌθəːmə(ʊ)dᵻˈfjuːʒn/
, /ˌθəːmə(ʊ)dᵻˈfjuːʒn/U.S. /ˌθərmoʊdᵻˈfjuʒ(ə)n/
diffusion of heat. [After German Thermodiffusion (1873 or earlier).] /ˌθərmoʊdᵻˈfjuʒ(ə)n/ΘΚΠ
the world > matter > physics > electromagnetic radiation > heat > transmission of heat > [noun] > diffusion
thermo-diffusion1899
thermal diffusion1916
1899 New Sydenham Soc. Lexicon Thermo-diffusion, diffusion (of gas) by inequalities of temperature.
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